Relating to the chemically active rays of the electromagnetic spectrum. [G. aktis (aktin-), a ray]
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ac·tin·ic ak-'tin-ik adj of, relating to, resulting from, or exhibiting chemical changes produced by radiant energy esp. in the visible and ultraviolet parts of the spectrum <\actinic injury and carcinogenesis (Jour. Amer. Med. Assoc.)> <\actinic keratosis>
ac·tin·i·cal·ly -i-k(ə-)lē adv
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ac·tin·ic (ak-tinґik) [aktin- + -ic] pertaining to those rays of light beyond the violet end of the spectrum that produce chemical effects.Medical dictionary. 2011.